After graduating from Northwestern University, Terry Marshall moved to San Francisco where he became one of the first writers for BAM Magazine and the Music Editor for the Earth News Service. Marshall's feature articles and reviews also appeared in Bay Area publications such as the San Francisco Chronicle, Bay Guardian and Times Tribune, among others. Throughout the 1980s and early `90s, Marshall was also the Bay Area correspondent for the Canadian publication, Music Express, contributing features on Bay Area artists as well as a monthly news column and concert and record reviews.

Marshall may be best known in the music industry as the publisher of The Daily Insider, the music news service which he launched in 1981. Billboard has called it, "a service that always manages to distinguish itself." The Monday-through-Friday publication has provided interviews and news items to more than 125 outlets in the U.S., Canada and the Far East, including such clients as MTV, Muchmusic, MJI, AT40, Playboy, MusiquePlus, X Radio Network, ABC Rock Network, Radio/TV Hong Kong, Star-TV and various trade publications.

Marshall's extensive knowledge of the music business and writing skills have also made him a successful provider of editorial services for all of the major labels and many of the industry's independent public relations firms. As the main writer for RCA Victor Records from 1994 to 2001, he drafted press releases and artist bios for a variety of releases by classical, classical crossover, pop, rock and jazz artists as well as in the Broadway cast recording and film soundtrack genres. Marshall has also worked for the PR firms MSO, Susan Blond, Big Monkey, Acquaviva Media and Shock Ink. Corporate clients have included Bug Music, HK Management, Q-Prime and Hi Frequency Marketing.